Concept explainers
(a)
To Explain: that this and experiment or not.
(a)
Answer to Problem 22E
Observational study
Explanation of Solution
This study attempted to demonstrate a connection between two groups of mothers or to compare live births. Although it was not a survey and there were no assignments, it was not an experiment, but an observational study.
(b)
To Test: a suitable hypothesis and give the conclusion.
(b)
Explanation of Solution
Formula used:
Calculation:
There is required to find out whether there is good evidence that air pollution could be associated with a significantly higher percentage of babies with low birth weight; this is achieved by contrasting data groups: mothers who were exposed to soot and smoke, and mothers who were not. Hence, is there a distinction between the two classes or not? Here is, here is
the hypothesis
This implies that there is no significant difference in the category of two mothers'
This implies that there is a significant difference in the category of two mothers'
This implies that in the category of two mothers, there is a significant difference
To find the p-value
Not find the
Next find the
The value of z is
Finally, using this value to find p in the Z table.
This p-value is very high then; thus, it does not reject it. There is no evidence of a significant differences between the two groups of the two mothers in this data.
(c)
To find: the difference with confidence interval and clarify the interval, there is a difference in the conclusion.
(c)
Explanation of Solution
There is no need to do an interval because it is failed to reject it. The difference will be calculated by this interval.
Chapter 22 Solutions
Stats: Modeling the World Nasta Edition Grades 9-12
Additional Math Textbook Solutions
Elementary Statistics
Essentials of Statistics, Books a la Carte Edition (5th Edition)
Essentials of Statistics (6th Edition)
Statistical Reasoning for Everyday Life (5th Edition)
Statistics for Business and Economics (13th Edition)
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